Do yourself a favor and DON'T upgrade to 1.1.3
I had a jailbroken iPod touch running 1.1.1 for months without any problem and with tons of software installed (> 100; yeah, you read that right).
A week ago I decided to update to jailbroken 1.1.3 and since I had to completely reinstall 3 times as the iPod locked up after installing additional apps (the threshold where this happens seems to be about 25).
It just happened
again, wtf
I really want easily rearrangeable icons and webclips, but if the prize is a reinstall every 3 days I will stay on 1.1.1